Ultrawideband and high-efficient polarization conversion metasurface based on multi-resonant element and interference...

Area of Science:

• Electromagnetics and Metamaterials
• Applied Physics
• Microwave Engineering

Background:

• Metasurfaces offer unique electromagnetic manipulation capabilities.
• Efficient polarization conversion is crucial for various microwave and antenna applications.
• Achieving ultrawideband performance with high polarization conversion ratios remains a challenge.

Purpose of the Study:

• To propose and demonstrate an ultrawideband and high-efficiency polarization conversion metasurface (PCM).
• To achieve efficient conversion of linearly polarized waves into cross-polarized waves over an ultra-wide frequency range.
• To analyze the physical mechanisms behind the metasurface's multi-resonance and polarization conversion properties.

Main Methods:

• Design and simulation of a PCM unit cell comprising L-shaped metallic patches, dielectric superstrate, and metallic ground.
• Analysis using an equivalent circuit model to understand multi-resonance and polarization conversion.
• Application of interference theory to calculate near-field interactions and reveal physical mechanisms.
• Validation through theoretical calculations, numerical simulations, and experimental measurements.

Main Results:

• The proposed PCM operates from 3.37 to 22.07 GHz with a polarization conversion ratio (PCR) exceeding 90% under normal incidence.
• Achieved an ultrawideband ratio bandwidth (fH/fL) of 6.5:1.
• Demonstrated 100% PCR at seven distinct resonant frequencies.
• Theoretical, simulated, and measured results show excellent agreement.

Conclusions:

• The developed PCM exhibits a simple structure with ultrawideband and high-efficiency polarization conversion capabilities.
• The study provides a comprehensive understanding of the underlying physical mechanisms.
• The proposed design offers a promising solution for advanced electromagnetic applications requiring efficient polarization control.